The Quarterly journal of the Geological Society of London . great hollowspongioles of Stigmaria. Fig. 11 #, ms. is a slice of the natural outer circle is the original form of the rootlet, now filled withclear calc-spar. Within this is the shrunken rootlet, in a carbonizedstate. Fig. 116, ms. represents the remains of the rootlet magnified,and showing an outer and inner cuticle with intervening cellulartissue having open spaces. Fig. 11c, ms. is a portion still morehighly magnified. Different opinions have been entertained respecting the mode ofgrowth of Sigillarice, owing to the suppo
The Quarterly journal of the Geological Society of London . great hollowspongioles of Stigmaria. Fig. 11 #, ms. is a slice of the natural outer circle is the original form of the rootlet, now filled withclear calc-spar. Within this is the shrunken rootlet, in a carbonizedstate. Fig. 116, ms. represents the remains of the rootlet magnified,and showing an outer and inner cuticle with intervening cellulartissue having open spaces. Fig. 11c, ms. is a portion still morehighly magnified. Different opinions have been entertained respecting the mode ofgrowth of Sigillarice, owing to the supposed uniformity of the ribsand leaf-scars along the whole length of the trunk. Mr. Binney,however, remarks, that a specimen in the Manchester Museum showsfour kinds of leaf-scars. The most distinctly marked erect trunkfound by us in the Joggins Section affords an interesting illustrationof this variety of marking. At the height of 5 feet above the base, Figs. 9, 10, & 11.—Ribs and Leaf-scars of erect Sigillaria stump, fromthe South Joggins. Fig. At from 2 to 3 feet from the root. Fig. 11.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
